hot
In my opinion, the space word beginning with "a" may be astronaut, or astronaumy. When it comes easy, it may be wrong. But hope I am right.
Some positive words beginning with H are: happy healthy heighten hero helpful heaven hope holy have hugs
HOMOSTARLIGHT
HotHairyHumbleHazadousHorribleHorridHoleyHolyHonorableHandsomeHighHomeyHomelyHungryHunkyHorrorHappy